US7640587B2 - Source code repair method for malicious code detection - Google Patents
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- US7640587B2 US7640587B2 US11/093,476 US9347605A US7640587B2 US 7640587 B2 US7640587 B2 US 7640587B2 US 9347605 A US9347605 A US 9347605A US 7640587 B2 US7640587 B2 US 7640587B2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/50—Monitoring users, programs or devices to maintain the integrity of platforms, e.g. of processors, firmware or operating systems
- G06F21/55—Detecting local intrusion or implementing counter-measures
- G06F21/56—Computer malware detection or handling, e.g. anti-virus arrangements
- G06F21/562—Static detection
- G06F21/564—Static detection by virus signature recognition
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- the present invention relates to network data processing systems and, in particular, to protecting against viruses. Still more particularly, the present invention provides an improved method, apparatus, and program for source code management.
- viruses programs known as computer “viruses” or “worms”.
- a computer virus is a section of code that is buried or hidden in another program. Once the program is executed, the code is activated and attaches itself to other programs in the system. Infected programs in turn copy the code to other programs. In this manner, virus code may spread throughout the computing system and, potentially, to other computing systems via network connections. The effect of such viruses can be simple pranks such as causing a message to be displayed on the screen, or more serious such as the destruction of programs and data.
- Computer worms are destructive programs that replicate themselves throughout a hard disk and/or memory within a computer using up all available disk or memory space. This replication eventually causes the computer system to crash since, eventually, there is no available disk or memory space to store data.
- protection programs To combat the increasing problem of computer viruses and worms, many computer users employ the use of protection programs to detect data packets that may contain viruses or worms and then eliminate them before the program associated with the data packet may be run.
- Existing protection programs typically employ pattern matching to identify malicious code. Pattern matching is a process wherein a file is scanned and its code compared against virus patterns stored in its database. If a virus signature is detected in the code, the file is isolated and notification is provided to the user that a virus is present in the scanned file. In this way, infected files may be identified and eliminated before they cause damage to the computer system.
- Source code comprises programming statements and instructions that are written by a programmer.
- Source code is what a programmer writes, but it is not directly executable by the computer.
- a developer of a product may introduce destructive code into the source, which may result in significant damage to both stored data and other software.
- the present invention provides a system and method for enhancing source code management by using existing virus detection methods in a library management system to detect potentially malicious code.
- malicious code that is introduced into a software product may be detected before the code is able to damage stored data and other software by preventing a product build with the destructive code.
- source code is received at a code management library system from a set of software developers in a collaborative development environment, the source code is moved into a staging area. A determination is then made as to whether malicious code exists in the source code. If malicious code exists, the library system removes the source code from the software product build and notifies the system administrator of the presence of malicious code.
- the mechanism of the present invention also provides a repair mechanism within the code management library system for repairing build code that is infected with malicious code.
- a virus pattern is detected in a component of a source code
- other components in the source code containing dependencies upon the first component are identified. This identification may be based on rules defined from relationships between the infected component and the other components in the source code.
- the component and the other components that are identified as having dependencies upon the infected component are retracted from the software product build.
- the infected component and the other identified components are then replaced with a previous archive of the code build.
- the software product build of the source code may then be performed.
- the mechanism of the present invention also provides a classification mechanism within the source code management system for customizing malicious code searches.
- This classification mechanism is used to limit the number of searches that are performed on incoming source code, as some malicious code searches may only need to be performed on particular modules, classes, components, etc. of the software product.
- security classifications are created for the source code.
- each component in the source code is associated to a security classification.
- a virus check is then performed on the components in the source code based on the associated security classifications. In this manner, only certain components may need to be checked for certain virus patterns, and other components may be checked for other virus patterns.
- FIG. 1 depicts a pictorial representation-of a distributed data processing system in which the present invention may be implemented
- FIG. 2 is a block diagram of a data processing system that may be implemented as a server in accordance with a preferred embodiment of the present invention
- FIG. 3 is a block diagram of a data processing system that may be implemented as a client in accordance with a preferred embodiment of the present invention
- FIG. 4 is a block diagram illustrating an overview of the process used for detecting malicious code in source code of a software product in accordance with a preferred embodiment of the present invention
- FIG. 5 is a block diagram of exemplary components that may be used in the source code management system to detect malicious code in accordance with a preferred embodiment of the present invention
- FIG. 6 is a flowchart of a process for enhancing source code management by using existing virus detection methods to identify potentially malicious code in the source code of a software product in accordance with a preferred embodiment of the present invention
- FIG. 7 is a flowchart of a process for customizing malicious code searches in accordance with a preferred embodiment of the present invention.
- FIG. 8 is a flowchart of a process for autonomically repairing a code build in accordance with a preferred embodiment of the present invention.
- FIG. 1 depicts a pictorial representation of a network of data processing systems in which the present invention may be implemented.
- Network data processing system 100 is a network of computers in which the present invention may be implemented.
- Network data processing system 100 contains a network 102 , which is the medium used to provide communications links between various devices and computers connected together within network data processing system 100 .
- Network 102 may include connections, such as wire, wireless communication links, or fiber optic cables.
- server 104 is connected to network 102 along with storage unit 106 .
- clients 108 , 110 , and 112 are connected to network 102 .
- These clients 108 , 110 , and 112 may be, for example, personal computers or network computers.
- server 104 provides data, such as boot files, operating system images, and applications to clients 108 - 112 .
- Clients 108 , 110 , and 112 are clients to server 104 .
- Network data processing system 100 may include additional servers, clients, and other devices not shown.
- network data processing system 100 is the Internet with network 102 representing a worldwide collection of networks and gateways that use the Transmission Control Protocol/Internet Protocol (TCP/IP) suite of protocols to communicate with one another.
- TCP/IP Transmission Control Protocol/Internet Protocol
- At the heart of the Internet is a backbone of high-speed data communication lines between major nodes or host computers, consisting of thousands of commercial, government, educational and other computer systems that route data and messages.
- network data processing system 100 also may be implemented as a number of different types of networks, such as for example, an intranet, a local area network (LAN), or a wide area network (WAN).
- FIG. 1 is intended as an example, and not as an architectural limitation for the present invention.
- Data processing system 200 may be a symmetric multiprocessor (SMP) system including a plurality of processors 202 and 204 connected to system bus 206 . Alternatively, a single processor system may be employed. Also connected to system bus 206 is memory controller/cache 208 , which provides an interface to local memory 209 . I/O bus bridge 210 is connected to system bus 206 and provides an interface to I/O bus 212 . Memory controller/cache 208 and I/O bus bridge 210 may be integrated as depicted.
- SMP symmetric multiprocessor
- Peripheral component interconnect (PCI) bus bridge 214 connected to I/O bus 212 provides an interface to PCI local bus 216 .
- PCI Peripheral component interconnect
- a number of modems may be connected to PCI local bus 216 .
- Typical PCI bus implementations will support four PCI expansion slots or add-in connectors.
- Communications links to clients 108 - 112 in FIG. 1 may be provided through modem 218 and network adapter 220 connected to PCI local bus 216 through add-in connectors.
- Additional PCI bus bridges 222 and 224 provide interfaces for additional PCI local buses 226 and 228 , from which additional modems or network adapters may be supported. In this manner, data processing system 200 allows connections to multiple network computers.
- a memory-mapped graphics adapter 230 and hard disk 232 may also be connected to I/O bus 212 as depicted, either directly or indirectly.
- FIG. 2 may vary.
- other peripheral devices such as optical disk drives and the like, also may be used in addition to or in place of the hardware depicted.
- the depicted example is not meant to imply architectural limitations with respect to the present invention.
- the data processing system depicted in FIG. 2 may be, for example, an IBM eServer pseries system, a product of International Business Machines Corporation in Armonk, N.Y., running the Advanced Interactive Executive (AIX) operating system or LINUX operating system.
- AIX Advanced Interactive Executive
- Data processing system 300 is an example of a client computer.
- Data processing system 300 employs a peripheral component interconnect (PCI) local bus architecture.
- PCI peripheral component interconnect
- AGP Accelerated Graphics Port
- ISA Industry Standard Architecture
- Processor 302 and main memory 304 are connected to PCI local bus 306 through PCI bridge 308 .
- PCI bridge 308 also may include an integrated memory controller and cache memory for processor 302 . Additional connections to PCI local bus 306 may be made through direct component interconnection or through add-in boards.
- local area network (LAN) adapter 310 SCSI host bus adapter 312 , and expansion bus interface 314 are connected to PCI local bus 306 by direct component connection.
- audio adapter 316 graphics adapter 318 , and audio/video adapter 319 are connected to PCI local bus 306 by add-in boards inserted into expansion slots.
- Expansion bus interface 314 provides a connection for a keyboard and mouse adapter 320 , modem 322 , and additional memory 324 .
- Small computer system interface (SCSI) host bus adapter 312 provides a connection for hard disk drive 326 , tape drive 328 , and CD-ROM drive 330 .
- Typical PCI local bus implementations will support three or four PCI expansion slots or add-in connectors.
- An operating system runs on processor 302 and is used to coordinate and provide control of various components within data processing system 300 in FIG. 3 .
- the operating system may be a commercially available operating system, such as Windows XP, which is available from Microsoft Corporation.
- An object oriented programming system such as JavaTM may run in conjunction with the operating system and provide calls to the operating system from JavaTM programs or applications executing on data processing system 300 . “Java” is a trademark of Sun Microsystems, Inc. Instructions for the operating system, the object-oriented programming system, and applications or programs are located on storage devices, such as hard disk drive 326 , and may be loaded into main memory 304 for execution by processor 302 .
- FIG. 3 may vary depending on the implementation.
- Other internal hardware or peripheral devices such as flash read-only memory (ROM), equivalent nonvolatile memory, or optical disk drives and the like, may be used in addition to or in place of the hardware depicted in FIG. 3 .
- the processes of the present invention may be applied to a multiprocessor data processing system.
- data processing system 300 may be a stand-alone system configured to be bootable without relying on some type of network communication interfaces.
- data processing system 300 may be a personal digital assistant (PDA) device, which is configured with ROM and/or flash ROM in order to provide non-volatile memory for storing operating system files and/or user-generated data.
- PDA personal digital assistant
- data processing system 300 also may be a notebook computer or hand held computer in addition to taking the form of a PDA.
- data processing system 300 also may be a kiosk or a Web appliance.
- the present invention provides a method, apparatus, and computer instructions for using existing virus detection methods in a library management system to detect potentially malicious code.
- Destructive code that is introduced into the source code of a software product may be detected before a product build is performed in order to prevent damage to stored data and other software.
- the damage potential may be based on the characteristics of the malicious code. For example, some malicious code may be used to attack important operating system files, leaving the system unstable or unable to re-boot.
- the present invention uses known methods of virus detection and incorporates these technologies into a source code management system.
- the present invention also provides a security administrator with the ability to update the virus detection methods and virus patterns as new viruses are identified, as well as when an additional function is added to the system that would require checking for new patterns or detection rules.
- virus pattern matching may be implemented as a desktop or server-based application that detects destructive code present in other client or server-based applications.
- virus pattern matching comprises using a signature file to identify potentially malicious code, wherein the signature file stores a list of known virus signature patterns.
- a scan engine may be used to scan a file and compare the code in the file against the content of the signature file. This comparison is performed to determine whether the file code contains a unique string of bits or binary pattern matching a pattern present in the signature file. If the scan engine identifies a matching pattern, the file is deemed to be infected and execution of the file is stopped.
- the signature file should be updated on a regular basis, as new viruses are potential threats. If the signature file does not contain the pattern of such a new virus, the virus can infect the system.
- virus pattern identification employs a process similar to the pattern matching process described above. However, the pattern identification process may differ and be configurable by application, operating system, and environment. The pattern identification process may also employ application specific rules to validate against. For example, only developer X may be allowed to make changes that touch component Y (e.g., the component controlling access to the system).
- the mechanism of the present invention implements virus pattern matching and pattern identification methods within a source code management system. These virus identification methods are used to detect malicious code submitted in the software development environment prior to the code being built into an executable package.
- a system administrator may define certain patterns of potentially malicious code based on the particular platform development environment, such as, for example, AIXTM, Microsoft WindowsTM, or JavaTM.
- the code management library system places the source code into a staging area.
- the code management software library uses the staging area to perform a check of the source code prior to incorporating the incoming source code into the product build. This check is performed using the pre-set patterns of potentially malicious code defined by the system administrator.
- the source code is compared against the pre-set malicious code patterns to identify if a match exists.
- the code management software library may send an alert to a trusted authority so that the suspect code may be reviewed. As the suspect code is in the staging area and not yet incorporated into the product build, the suspect code also may automatically be isolated as a result of the pattern match. Consequently, the product build is delayed. If a malicious pattern match is not found, the source code is sent to the build machine to build an executable software package.
- the mechanism of the present invention also provides a classification mechanism within the source code management system for customizing malicious code searches.
- This classification mechanism is used to limit the number of searches that are performed on incoming source code, as some malicious code searches may only need to be performed on particular modules, classes, components, etc. of the software product. By limiting the number of searches to be performed, the classification mechanism of the present invention may improve the performance of the source code virus detection.
- the mechanism of the present invention provides a repair mechanism within the code management library system for repairing build code that is infected with malicious code.
- malicious code may slip through to the product build. This situation may occur if the pattern matching files that are compared against incoming code are not updated regularly.
- an autonomic configurable function in the repair mechanism of the present invention “repairs” the infected build code by reverting to a previous archive of the code build.
- the repair mechanism may access a configuration management tool in the library system that retains versions of individual files and configurations of larger software entities such as product releases to obtain a previous version or file.
- the repair mechanism may autonomically rollback to a previous build regardless of where the offending code is located.
- the repair mechanism may also autonomically obtain the previous file containing the offending code from the configuration management tool and then rebuild the entire code.
- the actions taken by the repair mechanism are flexible, as they may depend upon the library administrator rules and may make use of existing functions.
- FIG. 4 a block diagram illustrating an overview of the process used in detecting destructive code introduced into source code in accordance with a preferred embodiment of the present invention is shown.
- the process illustrated in FIG. 4 may be implemented in a computer network, such as network data processing system 100 shown in FIG. 1 .
- this set of software developers may include a remote development team 1 in New York (NY) 402 , a remote development team 2 in Hong Kong (HK) 404 , and a remote developer X in London (LND) 406 .
- Each of these software developers may be implemented as a client machine, such as clients 108 , 110 , and 112 in FIG. 1 .
- Remote development team 1 in NY 402 contributes source code, such as source code A 408 to code management library system 414 .
- Code management library system 414 may be implemented as a server, such as server 104 in FIG. 1 .
- both remote development team 2 in HK 404 contributes source code B 410
- remote developer X in LND 406 contributes source code N 412 to code management library system 414 .
- a developer may also send malicious code, such as malicious code 415 , to code management library system 414 .
- source code arrives at the code management library system, the source code is placed within staging area 416 upon arrival.
- source code A 408 is held in staging area 416 so that this source code may be checked for viruses prior to being integrated into the software build.
- code management library system 414 performs a check based on pre-set patterns of potentially malicious code. This check may be performed in various circumstances including, but not limited to, when there is network access to a hard-coded host (e.g., uploading data), when there is file system access to “sensitive” files (e.g., email program address books, credit card information, etc.), and when there is file system access to “system files”. Pattern matching 418 performed may include existing virus pattern matching methods, such as comparing the incoming code against known virus signatures.
- code management library system 414 may send an alert to a trusted authority, such as security administrator 420 , for code review.
- Code management library system 414 may automatically quarantine the suspect code as well and thus deny the offending source code. Consequently, the software build is delayed. If the comparison does not result in any matches, the source code is deemed safe.
- the source code is subsequently sent to build machine 422 to build an executable software package.
- the build machine is independent of the code library management system, and the source code is stored on different servers than where the build actually occurs.
- FIG. 5 is a block diagram of exemplary components used to detect destructive code in the source code in accordance with a preferred embodiment of the present invention.
- the components used to implement the present invention are positioned as a front-end to code library management system 500 and are transparent to the library user.
- Those of ordinary skill in the art will appreciate that the components depicted in FIG. 5 may vary, as the staging area and functional implementations are tightly tied to the library system of choice.
- source code 502 is placed in staging area 504 .
- Staging area 504 holds source code 502 for testing prior to the code being incorporated into the product build.
- detection engine 506 may perform a check of source code 502 .
- detection engine 506 may use pre-set malicious code patterns 508 . The list of patterns may be defined by the system administrator and is compared against source code 502 to identify if a match exists.
- code management library system 500 in FIG. 5 may also incorporate a classification mechanism in accordance with a preferred embodiment of the present invention.
- the classification mechanism may be used to customize malicious code searches.
- the classification mechanism may comprise code categorization rules 510 , which may define the virus pattern check to be performed on a particular component of the code. Customization of searches to be performed on incoming source code allows for limiting the number of searches to be performed, and, as a result, this customization may improve the performance of the source code virus detection described above.
- code library systems are built on the component model.
- a security related code may be defined in a specific security package (com.ibm.someproduct.security) and managed in a code library under a component definition for that package. This provides a natural high source code into product.component.class.method.
- Code categorization rules 510 may be written by the system administrator at any desired granularity.
- the classification mechanism of the present invention may be utilized by detection engine 506 through code categorization rules 510 when the engine is performing the virus check.
- code categorization rules 510 contain rules for identifying the circumstances in which the virus checks should be performed, the rules may, for instance, define that a virus check may be performed when certain sensitive or system files are accessed. The rules may also define that certain developers may be allowed to touch certain areas of code, and then within those areas of code, pattern matching would be performed to identify the presence of any pattern matches.
- a component of an application may comprise source code that controls access to a system.
- the search performed on the incoming source code associated with the component may be customized to search for types of malicious code that would target passwords, creation of user IDs, etc.
- the classification method of the present invention enables certain parts of the incoming code to be checked for viruses.
- FIG. 6 is a flowchart of a process for enhancing source code management by using existing virus detection methods to identify potentially malicious code in the source code of a software product in accordance with a preferred embodiment of the present invention.
- the process described in FIG. 6 may be implemented in a data processing system, such as data processing system 300 in FIG. 3 .
- the process begins with a code management library system receiving source code from one of more software developers in a collaborative development environment (step 602 ).
- Various disconnected developers may provide source code to the code management software system.
- the source code is placed in a staging area (step 604 ).
- the code management library system then performs a check of the source code against pre-set patterns of potentially malicious code (step 606 ). In a preferred embodiment, this comparison may be performed when either a network access to a hard-coded host, a file system access to “sensitive” files, or when a file system access to “system files” occurs.
- step 608 if the comparison does not result in a pattern match, the source code is sent to the build machine to build an executable package (step 614 ).
- FIG. 7 is a flowchart of a process for customizing malicious code searches in accordance with a preferred embodiment of the present invention. Malicious code searches may be customized in order to limit the number of searches performed on the source code and improve the performance of the source code virus detection.
- the process described in FIG. 7 may be implemented in a code management library system, such as code management library system 500 in FIG. 5 .
- the process begins with the library administrator or security administrator creating new source code items, such as new components, tracks, packages, releases, etc. (step 702 ).
- the security classification for each of the new items may be assigned at that time.
- the classifications may be based on the definitions associated with each library implementation, but in general are as described in FIG. 5 above.
- the code management library system receives new source code written by a developer (step 704 ).
- the code may be checked into a particular library component that is classified with the security level for the particular source code.
- the code is placed in a staging area (step 706 ).
- classification rules are applied to the code (step 708 ) in order to identify how components of the code are to be checked for viruses.
- a decision is then made as to which particular virus pattern check is to be performed on each code component according to the code classification rules (step 710 ). For example, only certain components of the code may be checked for certain virus patterns, while other code components are checked for other patterns. In this manner, a large part of the code may not require virus checking at all, since most of the code may not touch sensitive areas.
- steps 712 - 720 of the process in FIG. 7 may be performed in a manner similar to the virus detection method described in steps 606 - 614 in FIG. 6 .
- FIG. 8 is a flowchart of a process for autonomically repairing a code build in accordance with a preferred embodiment of the present invention.
- the repair mechanism of the present invention may be implemented as an extension to code management library system 500 in FIG. 5 .
- the repair mechanism of the present invention allows for repairing infected build code by reverting to a previous archive of the code.
- the repair mechanism may autonomically rollback to a previous build regardless of where the offending code is located, or obtain the previous file containing the offending code from a configuration management tool and then rebuild the entire code.
- the process begins with detecting a virus pattern within a code component (step 802 ).
- a determination is made as to whether there are other components in the source code that contain dependencies upon the infected component (step 804 ). This determination may be made by checking the rules defining the relationships of the code components. For example, a set of classes may exist for each change set representing a build. Specific components of the source code may fall into one of the classes. The relationship between the components may be defined as rules that declare dependencies between these components.
- the repair mechanism of the present invention allows for only retracting an infected code component from the build, as well as retracting any other code component that has dependencies upon infected code.
- the identified code components may then be replaced with an archive of a previous code build (step 810 ).
- the entire source code (including any code not infected) may be replaced with a previous version of the build, or, alternatively, only those identified code components may be replaced with previous versions of the components.
- a new code build of the source code may then be performed using components obtained from previous code builds (step 812 ).
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US20060230449A1 (en) | 2006-10-12 |
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CN100423016C (en) | 2008-10-01 |
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